<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="../../js/jquery-3.4.1.js"></script>
    <script src="../plugin/customize/jquery.color.js"></script>
    <script src="../plugin/customize/jquery.number-util.js"></script>
    <style type="text/css">

        .red {
            width: 50px;
            height: 50px;
            color: red;
        }

    </style>
</head>
<body>
<div class="red">
    hello world
</div>
<div id="number1">

</div>
<button id="chooseBlueColor">变为蓝色</button>
<button id="chooseRedColor">变为红色</button>
<script type="text/javascript">

    $(function () {
        console.log($.max(2, 3, 44));
        $('#chooseBlueColor').click(function () {
            $('.red').color('blue');
        });
        $('#chooseRedColor').click(function () {
            $('.red').color('red');
        });

        $('#number1').text($.fixed(23, 2));
    });

</script>
</body>
</html>